diff --git a/mach/i386/ncg/mach.c b/mach/i386/ncg/mach.c
index 34a4b6f16..5f67a3dfb 100644
--- a/mach/i386/ncg/mach.c
+++ b/mach/i386/ncg/mach.c
@@ -34,13 +34,11 @@ con_part(sz,w) register sz; word w; {
 }
 
 void
-con_mult(sz) word sz; {
-	long l;
+con_mult(word sz) {
 
-	if (sz != 4)
+	if (sz != 8)
 		fatal("bad icon/ucon size");
-	l = atol(str);
-	fprintf(codefile,"\t.data4 %ld\n", l);
+	fprintf(codefile,".data8\t%s\n", str);
 }
 
 #define CODE_GENERATOR  
diff --git a/mach/i80/ncg/mach.c b/mach/i80/ncg/mach.c
index 968ececbe..84a87ff6e 100644
--- a/mach/i80/ncg/mach.c
+++ b/mach/i80/ncg/mach.c
@@ -32,12 +32,12 @@ void con_part(int sz, word w)
 	part_size += sz;
 }
 
-void con_mult(sz) word sz;
-{
+void
+con_mult(word sz) {
 
-	if (argval != 4)
+	if (sz != 4 && sz != 8)
 		fatal("bad icon/ucon size");
-	fprintf(codefile, ".data4\t%ld\n", atol(str));
+	fprintf(codefile,".data%d\t%s\n", (int)sz, str);
 }
 
 #define CODE_GENERATOR
diff --git a/mach/i86/ncg/mach.c b/mach/i86/ncg/mach.c
index d93eaba3d..17cc876b6 100644
--- a/mach/i86/ncg/mach.c
+++ b/mach/i86/ncg/mach.c
@@ -33,14 +33,11 @@ con_part(sz,w) register sz; word w; {
 }
 
 void
-con_mult(sz) word sz; {
-	long l;
+con_mult(word sz) {
 
-	if (sz != 4)
+	if (sz != 4 && sz != 8)
 		fatal("bad icon/ucon size");
-	l = atol(str);
-	fprintf(codefile,"\t.data2 %d,%d\n",
-			(int)l&0xFFFF,(int)(l>>16)&0xFFFF);
+	fprintf(codefile,".data%d\t%s\n", (int)sz, str);
 }
 
 #define CODE_GENERATOR 
diff --git a/mach/m68020/ncg/mach.c b/mach/m68020/ncg/mach.c
index f230761c4..0df6c8389 100644
--- a/mach/m68020/ncg/mach.c
+++ b/mach/m68020/ncg/mach.c
@@ -45,11 +45,11 @@ con_part(sz,w) register sz; word w; {
 }
 
 void
-con_mult(sz) word sz; {
+con_mult(word sz) {
 
-	if (sz != 4)
+	if (sz != 8)
 		fatal("bad icon/ucon size");
-	fprintf(codefile,".data4 %s\n",str);
+	fprintf(codefile,".data8\t%s\n", str);
 }
 
 #define IEEEFLOAT
diff --git a/mach/powerpc/ncg/mach.c b/mach/powerpc/ncg/mach.c
index 1a1d98d6c..218920ed9 100644
--- a/mach/powerpc/ncg/mach.c
+++ b/mach/powerpc/ncg/mach.c
@@ -41,12 +41,11 @@ con_part(int sz, word w)
 }
 
 void
-con_mult(word sz)
-{
+con_mult(word sz) {
 
-	if (argval != 4)
+	if (sz != 8)
 		fatal("bad icon/ucon size");
-	fprintf(codefile,".data4 %s\n", str);
+	fprintf(codefile,".data8\t%s\n", str);
 }
 
 #define CODE_GENERATOR  
diff --git a/mach/vc4/ncg/mach.c b/mach/vc4/ncg/mach.c
index 16ca94f35..68f205c06 100644
--- a/mach/vc4/ncg/mach.c
+++ b/mach/vc4/ncg/mach.c
@@ -29,11 +29,12 @@ void con_part(int sz, word w)
 	part_size += sz;
 }
 
-void con_mult(word sz)
-{
-	if (argval != 4)
+void
+con_mult(word sz) {
+
+	if (sz != 8)
 		fatal("bad icon/ucon size");
-	fprintf(codefile,".data4 %s\n", str);
+	fprintf(codefile,".data8\t%s\n", str);
 }
 
 #define CODE_GENERATOR